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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2635be824e6fde3448d0b976daaf9da136c261d6767ba6c29892f014827861c' 
  AND token = '3PLJ42aHiLbQJ3B1tRGA6SIAW+eGor+Z1kgvTDqt3io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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