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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c21c0830c33081ee14cb5222c7a83177ccbd36f52dce2b895ab3ce4011c3d14' 
  AND token = 'PRXI1hOqOIJKGHIuqWggw44DVrx9/maQttjiMznK41I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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