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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ce126d76bf642ae9be1405c7b784e53f270c691174481d597271cc397194b5' 
  AND token = '4MtgNOfPxOHpmcOBjAwcu8OWD4ZZVzUvG0KCEV8tEOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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