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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17054537503b6e8fe7694d146d64ba3712f5eb9d487d1da618cd145e352c588d' 
  AND token = '29j/c/42BrqrzYr2KKT207IulHhigxHu0MD4AZ69R0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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