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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaec057bdd4f049d3867ae6856153c41bb0ae62a73a5d8bdae5acbc39268760d' 
  AND token = '+J3io/L/iWcW+9XToBXRvu4uo0UEJ02xMVQI3Tkx0BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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