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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09311a73f2320022f1775b7d6fc610aca509c1566b9a03272bcbb0d56fd4a3f' 
  AND token = 'bF+cnFR7bfsrnedH8fyFQ2ht7VZPRSN+iR+mMHipZro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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