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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ba6cd51663b4bc65c5542e83fae041e4502f0077afd6b2cc5d5b5a0bc2a3a4' 
  AND token = 'BhHDKDyUNqPla0WNP0YU36DV/7NtmTzYlop62whuzOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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