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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfdccaf37096b3d601f63bd179c4f0a70d2957f46a71c2a08eb00dcfd6c9c9c' 
  AND token = 'nYYVwJALryCp4EtECNDE1OIYTbB0KxLbKewpvmJ3Jpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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