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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5391ba113c9eb996a2a612b316a1ed6e911101208c963ec51a607c883d2ffb62' 
  AND token = 'MClht4I4v8h4mq0oGARAzVytuetEWCSoIaCo8O6sv2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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