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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542a9a67d5cdb1550c347e873b20b6d82d66223d6d488768106b0dd619fe16cc' 
  AND token = 'TzwTML+JHNcMBN7TpmcFo0Lgz8uJ8uwXHI6X8USKfvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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