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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e9718a518a8c4da13f64d436f97b3ba19fc421e31290090286a2ed139e4709' 
  AND token = 'S+L1ZFVlyvUo0oK+kZpyvlNHvRp7de45a3mL/d4h82Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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