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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bf32c96ee21f4c4b49b0d79b2ce98b5a5c0bed2d715bfa9bf1b0f67cda5b5b' 
  AND token = 'IqXoxBPDjmMu5xxzI/B5vgitLHWwQ5T7wYvE4yXyYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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