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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c2dd38444ab12bb140d7f279bd97aafca7d66e2fdf0f665902b2dc375e2983' 
  AND token = '2zYLkb1pY8zQCv69XJBT7gXYM/MTQO26t2+/16WIQlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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