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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6350dc4759a3f008c3faab3637d33305e212cd86f3dedef25c59df7332362053' 
  AND token = '4j5BBko10jZbPeglk/wj4JwIXFJ2XkBJNzYSkc/2/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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