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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c40b9e5793611ba9efac7944ee4282357a9bf64ce1e3fb3301fa456b68d580a' 
  AND token = 'Bmlysz3W8cpGLsmyixdvWYVSu3LwGAdhtLrHR1dYNJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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