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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2110ab8ffe37fd76c41b402bd073145b3b8cf5a14dc2bded59efc4284fc9fb5' 
  AND token = '2NQ3siapKiVz5BWO+IzC4n3eph+xGdL18lB5p1kE9jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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