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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7e199adebbac2336f184f400fa52092049314d0aa62338f2a9274b7f1524e9' 
  AND token = 'C41n7ao9LxMwswb1E0nrpAE9RE/9IGY2orLPLlTs5Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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