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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28476e2ed0225663e4401b6a95490ecccbc4766dd59cb0776771d4d5cd218a0b' 
  AND token = 'bfVL+mjHA7Flfr4O84wqii7q6nOpVgum/Crno0IOiH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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