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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9951f2c2ccdb951798a78811d9ab22653b957bd367cf3c76ea7d51569b55846' 
  AND token = '4AYQ0pWzn8BaJ2kn2BJqMuiKlJn0102Vu0B7CewkV4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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