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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebd679b200d22de0eca0815882fd9f89b6dfcb1a1694c080dc4f45e00f9a0c7' 
  AND token = 'K+S0OiPqWLsl6ZplQcCORlJa7ybBGP+lfOPZKdulTYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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