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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fa1a2349a35c9dee8bd6ec68eb167b0857e343aca5112f4be76ac91aac2e2b' 
  AND token = 'YjDPZ2UX2f+6L7Acp8m70GmxzYMVC351ZgMgvNU54iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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