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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5e09d1ba4b3697dc55a86b87d63179baac090f355f11b7bc0e48831e11cab6' 
  AND token = 'ytt1fmrVyQzcK6GRogay81BHyonq/HAnj5AK9HglUaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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