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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67f757e253490dd0641c138df2c15c40d7a378129241c87b564397a439f9022' 
  AND token = 'Gz8hggFh5ERyH+tMpO8eabaU+r1k0MUwwT1plP/fbxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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