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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e8c9e4ad6620c734fa76c40bd909310554be3fb4852b5e2cb1bd7d6e6333d8' 
  AND token = 'FREDBXY8BbF2mxZ+oxyxwlCOl0Q1UjqL61ZKy0AXBNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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