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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6382a52625eaa29b1f0077e59d85957e43ac16493be137a15c6c3360e7566eab' 
  AND token = 'uysoGlORjb68y3HSx0Rz8iH1J4y3HGCRdyOMD48camU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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