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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f716c6697e8d41a500d24c05604e0777d084991d369262363f71b77653dd8a5' 
  AND token = 'YsDE9z1A0GxlzqLQJKAx9uul2CFAzdvDL3wBBciHdI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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