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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89565e778b971417ade64cc543824cd9d6745b9d226007410427b9b9f3c284fb' 
  AND token = '5UojivTE2+8jPlC+rXHen8WeuBQ5S0OvjaIFBJc4Q4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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