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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e11013aab93fa0b1901556e1fcdb1821aec409da525c58f3ae2fd02af517ec' 
  AND token = 'G6MWfV5f4ilfdOKTz2oKaZIljawudGF38TnRtjWpPDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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