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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6405a4cd0b2bbadb45fda7f8a95c14d221f07f79079e147e3a4c4555cbcd1e18' 
  AND token = 'WF9FJubbblwT9pk8Lly3Ci8CrPb/KU5Urx3urm8lLNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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