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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24a5353648474d10322354a7cb541f3d96d7275dc25de67e07634dabbbc0c94' 
  AND token = 'vV0Fy1xLql1clat1ySuXADFkPdu/jaff5qw4GxeKtn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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