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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705620ffb7d0751f20fc401a781814347eda640c6f9bdb97578fd32776bd8ab9' 
  AND token = 'QY2gb+DnoO+O0yTie2XROWLwx1a6RVjkWdwM4+J5Z8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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