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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d0632c5fb01b6d14580e0351ab15858a3c280205a79ddca0433df3211210c3' 
  AND token = 'd1T9ZEswtoyNK8vJVtk/J7ftFayTlq5TXbLFvYQacJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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