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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02616b47b8c4c25e2b02955fd9bfe79eb3b0176af0937b8871dbda132ae58ba3' 
  AND token = '0Q28NYl9ysPUDKBywfcinrvIIN8i+l6s6mWGrC/JUVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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