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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7e87b32162be38a8fb4922e2ca6dd15b77d8c66ebc52b2bea91ba3a4b05fa3' 
  AND token = 'S6pfJhu7dzLGmv0Agt2ZB+bnI3UODzknHrqHXeJpf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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