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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9951936fe31309d6a5d4082888564ed926959e7ed5a9782fd2a44521d2c8afd' 
  AND token = 'HUKRilvv/Pxj5Kj2EzCG2TzdROjcGSK9NLbZ06PH9EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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