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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7fbef0f4cf20152d7c8181c0082f0b3952b202f4048543956ee72e5395c4ac' 
  AND token = 'U22Dww6E4Sbmp2Soco2pO6eVjPzMjRQAiCMnP7eWNeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}