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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d6713e228994eb20ee90f2965c3f0b064e736a6e234d3e73b0bb4b17776598' 
  AND token = 'Lqkehf3aYm+8TcYiiPSZO9jWaSX+Ytvz2umlNIxqixc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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