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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a032a49006d7bee28c0285c6f60309980a1f71d8ad330ecd641fe7efc63270' 
  AND token = 'Rm6dMeiYCi+4RBklITN9PtQN0Pk1cozKi1014WAF/s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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