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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9200101f63b8cd212e3af8b8c4a39bebf31bfcb13c534f4ee8c68208dc3158' 
  AND token = 'iqEFDquR7cu+KRDLhTZK1z2448uJ2a5l4nwW4lJvOkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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