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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d4af30b91166babc0ac843b9c26b54a91310e73488991a7fb8b7c496cff44a' 
  AND token = 'WEemDDQonjOunyv8E6vIkBGLZ/Q1KfU2YnB3kWq9xQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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