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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6240f5eba02524de75af4ff51125066d888686e6387ce4c4e9c3ef085f5c7c6' 
  AND token = 'JQplCMAsq5wBvE+2oL1dzyzqiogz/SKcWNQmE1ld0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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