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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83b4add1c725a9ee2e2201428ea0e8253eedf84cf021a6e051884a8ffdedc6b' 
  AND token = 'j3RF3rh8x7mky1ZTd+IBA0xN1XwOTtWrWEtdiT7q9AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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