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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2912e396ddee5f1bb4834c141844574e852f99745fe6298e8595dc38b4ef7f' 
  AND token = '1I4aaOZ5ls3dpIDnSIc9Jq8ZqTYtyUn1bB0PT6/U06k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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