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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b05a8fd30f7b0780db81f5a2ad6588929929e767e1b3e6ff46a2515a618394' 
  AND token = 'EYlasHZNZIcawPKmyT4vMT4VVOhn8nWGV2GbidhkiQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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