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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaad5ac17ca8de8868ab1a8934cb4981582c37ba42c168b9bce9873589752dc' 
  AND token = 'sqniV733gBslUtXKMpvo/3nGy2aK0/+ZxzH+o8Rey2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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