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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f49b03b82a62f0db1e63ff6b6af06c00655c0a10fb04c896c0d54ad7974bcd' 
  AND token = 'lXYwCjUpN9zwaZyVsJfq18APq5Zmj3InVhVj9bar1QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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