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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e6c230b9cfed722362f1bb3bb861f6c4981afcb46f762f81e9e6ca590eb9ce' 
  AND token = 'ZG4iIe6XpvquOfrq14+s8VojVKiMfFOffubFcJP+Hak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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