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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8286d09dc4c57f3ad384f004ba4a8ec5e7b3354a4b7ec4dfea219ba7f062cc93' 
  AND token = '+XINI9yTnInWnw4b9B8Q0NxOkotYQLCSiGc91es7NTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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