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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85eb74eebe520f8247e2847d6cad50bfb251e0efab53efc49dba92211cd8f81' 
  AND token = 'ga0VHw2+mfilcv9Tfs07QF/q0y3pAq+J2hR1fImMdW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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