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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5a352132d0fb98b1538974e1ed648e587e4e1b5541dcc322841e09125580bd' 
  AND token = 'o7KfOOcwiev9O82fCbFDi9k6Kh8aCE0rJYLYptAa4aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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