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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e709f7f39859d23258c4628c40a7c51fefbdda2292818ef1bfc2253d3db39a' 
  AND token = 'Rr8WBpJ5XIfq/dGz15fZz6JD14q66ZKEPHhe4KdneHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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