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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6396dd1c1bb54826078f4b760bb61f195aa82e767fbf2a92a695166c835480a' 
  AND token = 'x+CRojyUP5kUy2VLIyQwq/Kj2O2+8cH6Tr3+S9eziH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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