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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981b3ef888de8c2b333254711b7b73456f858ff509b7f6ebc7ec34b30f80c863' 
  AND token = 'G7WSKYZx8sUVVfMch20gpnO5AHGA8gPBbA3m8A5oAq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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